Tim Green, MGTS Precision Linear Analog Applications January 8, 2015

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Presentation transcript:

Tim Green, MGTS Precision Linear Analog Applications January 8, 2015 OPA316 Cap Drive Tim Green, MGTS Precision Linear Analog Applications January 8, 2015

OPA316 Zo Test

OPA316 Zo Test

Zload Test

Zload & Zo Difference in slopes = 20dB/decade implies no resonance between Zo and Zload which makes stability compensation possible

OPA316 Modified Aol Test

OPA316 ModAol, FB#1 and where to add FB#2

OPA316 Final Loop Gain Test

OPA316 Final Loop Gain Test Phase Margin = 62 degrees

OPA316 Square Wave Transient Stability Test

OPA316 Square Wave Transient Stability Test

OPA316 Square Wave Transient Stability Test

OPA316 Closed Loop Transient AC

OPA316 Closed Loop Transient AC

OPA316 Recommended Circuit for Real World Protection DA_DB divert any real world transients around op amp output into Vcc supply or Ground. TVS1 absorbs any real world positive transients since positive LDO can only source current and not sink current.

For Op Amp Stability Primer: http://e2e.ti.com/support/amplifiers/precision_amplifiers/w/design_notes/2645.solving-op-amp-stability-issues.aspx Note: Appendix 13 covers the Riso with Dual Feedback compensation technique used in this application.

Free SPICE Simulator from TI: All schematics embedded in this presentation can be run using TINA-TI available at this link: http://www.ti.com/tool/tina-ti